A Roon endpoint is anything that can receive a network stream from a Roon Core. Some have inbuilt DACs and some output a digital signal that can feed a stand alone DAC or the internal DACs in digital amps or digital active speakers.
You don’t have to. Just connect the digital output of an endpoint to the digital in of the amp.
The endpoint itself won’t have an analog output unless it has an inbuilt DAC. Choose the SQ you want.
Sonore make a UPnP Bridge app that runs on their SonicOrbiter platform. I haven’t tried it but I understand it sits on a network and enables RAAT to speak to DLNA connected equipment. It uses the Squeezebox protocol.